Outlook doesn't support importing to a custom form or custom fields, or even directly to a public folder. You'd have to write custom code or use a third-party application. See http://www.outlookcode.com/d/customimport.htm.

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I have an Excel document with fields that do not match the default contact
> fields. I have created a custome form and published it to a public folder and
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> do to enable this option so I can import my contacts from the spreadsheet
> using the new form? O am using Outlook 2003.